https://ad.easa.europa.eu/ad/2021-0230 pour SCHLEICHER, ALEXANDER AS-K 13, ASK 16, ASK 16B, ASK 18, ASK 18 B, K 8, K 8 B, K 8 C and K 7 sailplanes and powered sailplanes, all serial numbers (s/n), and Ka 6, Ka 6 B, Ka 6 BR, Ka 6 C, Ka 6 CR, Ka 6/0 sailplanes, all s/n.